The Sony DT 16-50mm F2.8 SSM is a fast-aperture standard zoom lens for Sony's APS-C format SLT cameras. Covering an effective focal length range of 24-75mm, this lens is an ideal 'carry everywhere' zoom, capable of really nice image quality. Its constant maximum aperture of F2.8 makes it more capable in poor light than the average 'kit' zoom and at 75mm equivalent, F2.8 is fast enough for relatively shallow depth of field portraiture. Optical construction includes aspherical and ED (extra low dispersion) glass elements and its weather-resistant design features interlocking seals to protect against dust and moisture ingress. All things considered, this is a great lens for APS-C Sony SLT shooters.